#pragma once
#include <iostream>
#include <functional>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <strings.h>
#include "Log.hpp"

using namespace LogModule;


using func_t = std::function<std::string(const std::string&)>;
const int defaultfd = -1;

class UdpServer
{
public:
    UdpServer(func_t func, uint16_t port)
        :_func(func), _port(port), _isrunning(false), _sockfd(defaultfd)
    {}

    void Init()
    {
        _sockfd = socket(AF_INET, SOCK_DGRAM, 0);
        if(_sockfd < 0)
        {
            LOG(Level::FATAL) << "socket error!!";
            exit(1);
        }
        LOG(Level::INFO) << "socket success! sockfd:" << _sockfd;

        struct sockaddr_in local;
        bzero(&local, sizeof(local));
        local.sin_family = AF_INET;
        local.sin_port = htons(_port);
        local.sin_addr.s_addr = INADDR_ANY;

        int n = bind(_sockfd, (struct sockaddr*)&local, sizeof(local));
        if(n < 0)
        {
            LOG(Level::FATAL) << "bind error!";
            exit(2);
        }
        LOG(Level::INFO) << "bind success!!, sockfd:" << _sockfd;

    }

    void Start()
    {
        _isrunning = true;
        while(true)
        {
            char buffer[1024];
            struct sockaddr_in peer;
            socklen_t len = sizeof(peer);
            ssize_t s = recvfrom(_sockfd, buffer, sizeof(buffer) - 1, 0, (struct sockaddr*)&peer, &len);
            if(s > 0)
            {
                int peer_port = ntohs(peer.sin_port);
                std::string peer_ip = inet_ntoa(peer.sin_addr);

                buffer[s] = 0;
                std::string result = buffer;

                sendto(_sockfd, result.c_str(), result.size(), 0, (struct sockaddr*)&peer, len);
            }
        }
    }

    ~UdpServer()
    {}
private:
    int _sockfd;
    uint16_t _port;
    bool _isrunning;
    func_t _func;
};